10 GEOLOGICAL AND MINEKALOGICAL NOTES : NO. 5. 



southwesterly direction across Magnolia, Manchester and 

 to the Beverly shore, is an outcrop of granophyre which 

 appears again as a typical granulite in the west cove of 

 Moulton's Misery Island in Salem harbor. To the north 

 this formation cuts the hornblende-granite and augite-sye- 

 nite from Eastern Point to the shore line at Bass Rocks. 

 From Rocky Neck, East Gloucester, to Bass Rocks, the 

 contact of this granophyre and the hornblende-granite is 

 strongly marked and easily followed. Across Little Good 

 Harbor beach and opposite Salt Island to the inner point 

 of Briar Neck, there are numerous tongues of this rock in- 

 truding into the hornblende-granite, while the main mass 

 of the rock is seen on the outer side of Salt Island. It 

 reaches the main land on the shore in the middle of Long 

 beach where it divides, one part following the shore line 

 to Cape Hedge and Emerson's Point, and reaching across 

 to the west side of Loblolly Cove, while the other mass cuts 

 across the granite to Gap Head and Straitsmouth Island, 

 and appears in numerous outcrops from Whale Cove to the 

 town of Rockport. Between Freshwater Cove Village and 

 West Gloucester, this granophyre has the appearance of a 

 massive flow, and it has a similar character where it crosses 

 Eastern Point from Rocky Neck to Bass Rocks. On Em- 

 erson's Point and Gap Head, however, it is seen in dome- 

 shaped masses a few feet in diameter, clearly embedded in 

 granite and also varying from this to extensive eruptive 

 forms. It is probable that this entire formation has a mas- 

 sive, intrusive, granitic structure, which has in places wi- 

 dened out into dome shapes, while in others it has become 

 contracted into dike-forms from a few inches to a number 

 of feet in width. It is clear that some of the rounded 

 masses are seen as surface outcrops by the erosion of the 

 surrounding granite at a comparatively recent date. 



